set_clip_properties

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Adjusts a clip. Only the provided fields change. Mix: volume (0–2, 1 = unity), fadeInFrames / fadeOutFrames (gain or opacity ramps at the edges). Look: opacity (0–1), blend (normal | multiply | screen | overlay | darken | lighten | color-dodge | color-burn | hard-light | soft-light | difference | exclusion | add), transform, crop and speed. transform.fit picks how the picture meets the frame before scaling: contain (letterbox, default) | cover (fill + crop overflow) | fill (stretch, ignores aspect). Identity = contain fit; position is offset from centre in timeline pixels (y down), scale multiplies the fitted size, rotationDeg is clockwise about the anchor (a fraction of the cropped picture, 0.5/0.5 = centre). Crop takes fractions off each edge of the source. Retiming: `speed` (constant rate/direction) and `speedKeyframes` (source-anchored rate curve; reflows length). Shape masks: `masks` (full-list replace). `disabled` parks a clip (it stays but neither renders nor sounds — DaVinci's D). `text` restyles text clips (mediaRef 'text:'). `motion` customizes MOTION clips (mediaRef 'motion:<id>') per clip.